Patent Grant
11719467
The present disclosure relates generally to intermittent flame-powered pilot combustion systems, and more particularly to systems and methods for controlling a water heater having an intermittent flame-powered pilot combustion system.
Energy efficiency is increasingly important for gas-powered appliances, such as hot water heaters, space heaters, and furnaces. In many gas-powered appliances, a flame powered combustion controller is used, where energy from a standing pilot flame is used to power the combustion controller. Standing pilot systems often obtain electrical power after a successful ignition sequence from a thermoelectric device (e.g., a thermopile) capable of generating electricity using the flame from the pilot burner, the main burner, or both. Thus, no external power source may be required. Line voltage power is typically not conveniently available where standing pilot systems are installed. As such, in many such systems, if the pilot flame is extinguished, power is lost to the combustion controller.
To improve energy efficiency, intermittent pilot systems have been developed. Intermittent pilot systems typically have a spark ignition system that ignites a pilot flame during each call for heat to the gas-powered appliance. Once the pilot flame is ignited, a main valve of the gas-powered appliance may be activated, allowing the pilot flame to ignite a main burner. Once the call for heal is satisfied, the main burner and pilot flame may be extinguished, thereby saving energy and cost. A drawback of many intermittent pilot systems is they require line voltage to operate.
What would be desirable is a way to operate a flame powered system in a manner similar to an intermittent pilot system. This requires storing electrical energy that the system generates for later use to reignite the pilot and/or main burner and to operate the control for a period of time.
The present disclosure relates generally to intermittent flame-powered pilot combustion systems and more specifically to systems and methods for controlling a water heater having an intermittent flame-powered pilot combustion system.
An example water heater may include a water tank, a main burner, a pilot for igniting the main burner, an ignitor for igniting the pilot, a thermoelectric device in thermal communication with a flame of the pilot, a controller for controlling an ignition sequence of the pilot using the ignitor, and a rechargeable power storage device for supplying power to the ignitor and the controller. The rechargeable power storage device may be rechargeable using the energy produced by the thermoelectric device. During operation, when the rechargeable power storage device is detected to have a charge that has not fallen below a charge threshold, the pilot and the main burner may be run to heat the water in the wafer lank when the temperature of the water in the water tank falls to a lower temperature setpoint threshold, and both the pilot and the main burner are terminated when the temperature of die water in the water tank reaches an upper temperature setpoint threshold. However, when the rechargeable power storage device is detected to have a charge that has fallen below the charge threshold, an illustrative method may include: when the temperature of the water in the water tank is at or above the lower temperature setpoint threshold and below the upper temperature setpoint threshold, run the pilot but not the main burner to heat die water in the water tank for a first heating segment toward the upper temperature setpoint threshold, and run the pilot and the main burner to heat the water in the water tank for a second heating segment toward the upper temperature setpoint threshold. It is contemplated that the charge threshold may he at or near a full charge, 10 percent below a full charge, 20 percent below a full charge, or any other suitable charge threshold.
It is contemplated that the first heating segment may occur before or after the second heating segment. In some eases, the first heating segment and the second healing segment may be configured such that there is sufficient time to fully recharge the rechargeable power storage device using energy produced by the thermoelectric device at or before the water in the water tank is heated to the upper temperature setpoint threshold.
In another example, it is contemplated that the controller of the water heater may be configured to control the pilot and the main burner to maintain the temperature of water in the water tank between a lower temperature setpoint threshold and an upper temperature setpoint threshold. The controller may detect when the rechargeable power storage device has a charge that has fallen below a charge threshold, and in response, the controller may control the pilot and the main burner to fully recharge the rechargeable power storage device while maintaining the temperature of water in the water tank between the lower temperature setpoint threshold and the upper temperature setpoint threshold.
In some cases, the controller is configured to determine when the temperature of the water in the water tank is at or above the lower temperature setpoint threshold and below the upper temperature setpoint threshold, and when the rechargeable power storage device has a charge that has fallen below the charge threshold, and in response, the controller may am the pilot but not the main burner to heat the water in the water tank for a first heating segment toward the upper temperature setpoint, threshold, and run the pilot and the main burner to heat the wafer in the water tank for a second heating segment toward the upper temperature setpoint threshold. The first healing segment and the second heating segment may be configured such that there is sufficient time to fully recharge the rechargeable power storage device using energy produced by the thermoelectric device at or before the time that the water in the water tank is heated to the upper temperature setpoint threshold.
The controller may be configured to detect when the rechargeable power storage device has a charge that has not fallen below a charge threshold, and in response, run the pilot and the main burner to heat the water in the water tank when the temperature of the water in the water tank falls to the lower temperature setpoint threshold, and not run the pilot or the main burner when the temperature of the water in the water tank rises to the upper temperature setpoint threshold.
In some instances, a water usage profile may be used to determine a higher water usage period and a lower water usage period. The usage profile may include of multiple higher water usage periods and multiple lower water usage periods which may have various temperature setpoints, upper temperature setpoint thresholds, and lower temperature setpoint thresholds. When the rechargeable power storage device has a charge that has fallen below a charge threshold, and during the high water usage periods, the controller may run the pilot and the main burner to heat the water in the water tank when the temperature of the water in the water tank falls to a lower temperature setpoint threshold, and the controller may not run either the pilot or the main burner when the temperature of the water in the wafer tank reaches an upper temperature setpoint threshold. When the rechargeable power storage device has a charge that has fallen below a charge threshold, and during the low water usage periods, the controller may run the pilot but not the main burner to heat the water in the water tank for a first heating segment toward the upper temperature setpoint threshold when the temperature of the water in the water tank is at or above the lower temperature setpoint threshold and below the upper temperature setpoint threshold. In some cases, when the rechargeable power storage device has a charge that has fallen below a charge threshold, and during the higher water usage period, the controller may run the pilot and the main burner to heat the water in the water tank fora second heating segment toward the upper temperature setpoint threshold. It is contemplated that the first heating segment may occur before or after the second healing segment, in some cases, the first heating segment and the second healing segment may be configured such that there is sufficient time to folly recharge the rechargeable power storage device using energy produced by the thermoelectric device at or before the time that the water in the water tank is heated to the upper temperature setpoint threshold.
In some cases, a water draw may cause the water temperature to fall below the lower temperature setpoint threshold (i.e., the water temperature is not at a temperature that is at or above the lower temperature setpoint threshold). In these cases, the controller may run the main burner to recover the water temperature to a temperature that is at or above the lower temperature setpoint threshold but still below the upper temperature setpoint threshold. If the charge level is below the upper charge limit, running the main burner may charge the rechargeable power storage device. In some eases, when the water temperature reaches the lower temperature setpoint threshold, the controller may run the pilot to complete the charging of the rechargeable power storage device or run the pilot for a first heating segment followed by the pilot and main burner for a second heating segment to complete the charging of the rechargeable power storage device.
The preceding summary is provided to facilitate an understanding of some of the innovative features unique to the present disclosure and is not intended to be a full description. A full appreciation of the disclosure can be gained by taking the entire specification, claims, drawings, and abstract as a whole.
The disclosure may he more completely understood in consideration of the following description of various embodiments in connection with the accompanying drawings, in which:
The following description should he read with reference to the drawings wherein like reference numerals indicate like elements throughout the several views. The description and drawings show several embodiments which are meant to be illustrative in nature.
As shown in
During operation, the controller 24 may initiate an ignition sequence. During the ignition sequence, the controller 24 may command a pilot valve 16A to open to supply gas to the pilot 16. Once gas is present at the pilot 16, the controller 24 may command the ignitor 18 to ignite a flame at the pilot burner 32. The controller 24 may then command the main valve 14A to open to allow ignition of a main flame of the main humor 14 using the pilot flame.
The thermoelectric device 20 may be exposed to the pilot flame, and thus may generate power whenever the pilot flame is present. The rechargeable power storage device 22 (e.g., a battery and/or a capacitor) may be configured to be rechargeable using energy produced by the thermoelectric device 20. The controller 24 may be in communication with the thermoelectric device 20 and the rechargeable power storage device 22, and may be configured to monitor and maintain a charge level of the rechargeable power storage device 22 at or above a charge threshold. When the controller 24 detects that the rechargeable power storage device 22 has a charge level at or above the charge threshold, the controller 24 may not pass energy from the thermoelectric device 20 to the rechargeable power storage device 22, or in some cases, may only pass a trickle charge to maintain anti/or top off the charge level of the rechargeable power storage device 22. Conversely, when the controller 24 detects that the rechargeable power storage device 22 has a charge level that has fallen below the charge threshold, the controller 24 may pass energy from the thermoelectric device 20 to the rechargeable power storage device 22 to recharge the rechargeable power storage device 22. In some cases, the controller 24 may obtain its operational power exclusively from the rechargeable power storage device 22, and thus maintaining a sufficient charge level on the rechargeable power storage device 22 may be necessary for continued operation of the controller 24 and thus the water heater 11.
In some cases, the memory storage 26 may be integral to the controller 24. included as a separate memory device, or both. The controller 24 may communicate with the memory storage 26 via one or more data/address lines. The memory storage 26 may be used to store any desired information, such as control algorithms, set points, schedule times, or instructions. The memory storage 26 may be any suitable type of storage device including, but not limited to RAM. ROM, EEPROM, flash memory, a hard drive, and/or the like. In some cases, the controller 24 may store information within the memory storage 26, and may subsequently retrieve the stored information. In some cases, the memory storage 26 may store a water usage profile 28. The water usage profile 28 may, in some cases, designate a number of higher water usage periods and a number of lower water usage periods, as illustrated for example in
In some cases, the controller 24 may be in communication with a server 36. The server 36 may receive information from a cloud 38 and translate that information into information usable by the controller 24. In some cases, the server 36 may be part of the cloud 38. In some cases, a user may provide information to the server 36 (sometimes via the cloud 38) through a wireless and/or wired device (e.g., a smart device, a computer, and/or other suitable device) describing a desired water usage profile 28. The server 36 may then deliver that information to the controller 24, and that information may be stored as pan of the water usage profile 28 stored in the memory storage 26. In some cases, a user may specify other information to the server 36, such as an updated temperature set point for the water heater 11. The updated temperature set point may be communicated from the server 36 to the controller 24, and the controller 24 may then begin using the updated temperature set point. In some cases, the controller 24 can communicate information to the server 36, such as the current the temperature set point, some or all of the water usage profile 28 stored in the memory, certain performance parameters of the water heater 11 and the like. This information may be made accessible to a user (e.g., homeowner, contractor, etc.) via the cloud 38.
The charge level of the rechargeable power storage device 22 is shown at 200, where an upper charge limit (e.g., a full charge level) is indicated at 220 and a lower charge limit is indicated at 230. It is contemplated that the upper charge limit (e.g., a full charge level) 220 and the lower charge limit 230 may each be considered thresholds, and sometimes may be referred to as the upper charge threshold 220 and the lower charge threshold 230. Although not explicitly shown in
As illustrated in
By turning off both the pilot 16 and main burner 14 when the water temperature reaches the upper temperature setpoint threshold 110, the water temperature will not continue to heat, as might occur in standing pilot appliances. This may help prevent the water temperature in the water tank 12 from reaching unsafe temperature levels (e.g., the safety temperature threshold, typically 165 degrees For 180 degrees F). Rather, the water temperature may gradually cool over time unlit the water temperature reaches the lower temperature set point threshold 120 as shown.
As illustrated in
Because the pilot 16 is lit during the first heating segment 150, the thermoelectric device 20 will be exposed to the pilot flame, and will generate power that can be used by the controller 24 to recharge the rechargeable power storage device 22. The pilot 16 does not apply as much heat to the water in the water tank 12 as the main burner 14, and as such, in the pilot only mode, the temperature of the water in the water tank 12 increases at a lower heating rate than when the main burner 14 is on. While this does not heat the water to the upper temperature set point threshold 110 as fast as when the main burner 14 is also on, it docs allow the pilot 16 to be lit for a longer period of time during a water heater cycle. This may allow the power generated by the thermoelectric device 20 to he applied to recharge the rechargeable power storage device 22 for a longer period of time, which may allow the rechargeable power storage device 22 to he charged further during a heating cycle. In some cases, the first heating segment 150 may be sufficient to restore the charge level 240 to an upper charge limit 220 (e.g., a foil charge level) as shown by 180 in
During the higher water usage period 310, as determined by the water usage profile 28, the controller 24 may attempt to only use the second heating segment 160 in the combination pilot and main burner mode to heat the water from the lower temperature setpoint threshold 120 to the upper temperature setpoint threshold 110. The first heating segment 150 using the pilot only mode may not be used unless necessary, for example, if the charge level 240 were to drop below the lower charge limit 230 but the water temperature was above the lower temperature setpoint threshold 120, the pilot only mode may be used to heat the water while raising the charge level 240 to the upper charge limit 220. In another example, if the charge level 240 of the rechargeable power storage device 22 were to continue to fall further below the lower charge limit 230 for “N” consecutive heating cycles (where N is an integer greater than 1), the controller 24 may interject a first heating segment 150 using the pilot only mode to help restore the charge level 240 of the rechargeable power storage device 22. In general, the controller 24 may interject such a first heating segment 150 using the pilot only mode when necessary to maintain an adequate charge on the rechargeable power storage device 22.
During the lower water usage period 320, it is often desirable to decrease the water temperature setpoint to save energy, as shown in
In
In these and other embodiments, once the water temperature 100 has risen to the upper temperature setpoint threshold 110, the pilot 16 and the main burner 14 may receive commands from the controller 24 to shut down. By shutting down both the pilot 16 and the main burner 14 once the water temperature 100 has risen to the upper temperature setpoint threshold 110, the water temperature 100 will not continue to heat to dangerous levels, as could occur with standing pilot appliances.
However, in some cases, it is possible for the water temperature 1(H) to continue to heat. For example, in high ambient temperatures, and when the temperature setpoint is set fairly tow. the charge level 240 may drop to the lower charge limit 230 and the water temperature 100 may be above the upper temperature setpoint threshold 110. To handle this condition, the controller 24 may incorporate a minimum “stay alive” charge threshold (not shown) which is lower than the lower charge limit 230. There may also be a “low charge” safety temperature threshold (not shown). If the charge is below the lower charge limit 230, but above the “stay alive” charge threshold, then the pilot 16 may be lit to recover charge until the charge level reaches the upper charge limit 220 or the water temperature 100 reaches the upper temperature setpoint threshold 110 If the charge drops to the “stay alive” charge threshold, then the pilot may be lit to recover charge until the charge reaches the upper charge limit 220 or the water temperature 100 reaches the safety temperature threshold.
In some eases, the controller 24 may learn a water usage profile 28 by monitoring the water usage over time. For example, hot water usage may be monitored over seven days or longer. A daily usage profile, margin of error and daily pattern may be determined. A weekly usage pattern or day by day usage pattern may be maintained, thereby creating a water usage profile 28 that may be used by the controller 24 to determine when to initiate the first heating segment 150 using the pilot only mode and/or the second heating segment 160 using the combination pilot and main burner mode as discussed above.
In some cases, a user may create a weekly usage profile using a user interface of the controller 24, an external user interface of a computer, or other device (e.g., a smart device). The device may accept a water usage profile 28 from the user, which may specify expected water usage for each day of a week and at what times. In some cases, a user may enter such information through a wireless and/or wired device (e.g., a smart device, a computer, and/or other suitable device), which may then be transmitted to a server 36. That information may he delivered and stored in the water usage profile 28 stored in the memory storage 26. In some cases, a weekly usage routine for a day by day usage pattern may be updated as needed. In some cases, it may be contemplated that there are multiple higher water usage periods 310 in a day and/or multiple lower water usage periods 320 in a day. It may be further contemplated that these water usage periods may vary from day to day.
At 460, the rechargeable power storage device charge level 200 has a charge that has fallen below the charge threshold. At 470, when the charge has fallen below the charge threshold and the water temperature is at or above the lower temperature setpoint threshold and below the upper temperature setpoint threshold, the water heater may run the pilot and not the burner (i.e. pilot only mode) to heat the water in the water tank for a first heating segment toward the upper temperature setpoint threshold as shown at 480. The water heater may then nut the pilot and the burner (i.e. combination pilot and burner mode) to heat the water in the water tank for a second heating segment toward the upper temperature setpoint threshold as shown at 490.
In the case when the rechargeable power storage device has a charge that has fallen below a charge threshold as shown at 540, and during a high water usage period as shown at 545. the water heater may run the pilot and the burner (i.e. combination pilot and burner mode) to heat the water in the water tank when the water temperature falls to a lower temperature setpoint threshold as shown at 550. When the temperature of the water rises to an upper temperature setpoint threshold, the water heater may no longer run the pilot or the burner as shown at 555. As shown at 560, during the lower water usage period, and when the temperature of the water is at or above the lower temperature set point threshold and below the upper temperature setpoint threshold, the water heater may run the pilot but not the burner (i.e. pilot only mode) to heat the water in the water tank for a first heating segment toward the upper temperature setpoint threshold at shown at 565. In addition or alternative, and although not explicitly shown, another exemplary method for controlling a water heater may include the water usage profile determining when to heat the water in the water tank 12 to a temperature set-point using only the pilot 16, and not using the main burner 14 at all. When so provided, the water usage profile may be used to determine if there is sufficient time to heat the water using the pilot 16 only (e.g. sufficient time before an upcoming high water usage period).
At 645, if the charge level is above the “stay alive” charge threshold but less than or equal to the lower charge limit, and the water temperature is less than or equal to the lower temperature setpoint threshold as shown at 655, both the pilot and the main burner are turned off as shown at 660 and the system returns to start as shown at 705. At 655, if the water temperature is not less than or equal to the lower temperature setpoint threshold (e.g., the water temperature is between the lower temperature setpoint threshold and the safety temperature threshold), the pilot is turned on and the main burner is turned off, and the system may return to start as shown at 705.
If at 645 the charge level is not between the “stay alive” charge threshold and the lower charge limit, then the charge level must be between the lower charge limit and the upper charge limit and the burner state would then be evaluated as shown at 650.
If at 650 both the pilot and the main burner are off, and if at 670 the water temperature is less than or equal to the lower temperature setpoint threshold, then both the pilot and the main burners would be turned on. as shown at 680. If at 650 both the pilot and the main burner are off, and if at 670 the water temperature is greater than the lower temperature setpoint threshold, then the pilot and the main burner would remain in their current state and the system would return to start as shown at 705.
If at 650 either the pilot is on, or both the piled and the mam burner are on, and if at 675 the water temperature is above the upper temperature setpoint threshold, then both the pilot and main burner would be turned off, as shown in 685, and the system would return to start as shown at 705. If at 650, either the pilot is on, or both the pilot and the main burner are on, and if at 675 the wafer temperature is below the upper temperature setpoint threshold, then the usage mode must be evaluated, as shown at 690.
If at 690 the usage mode is either the high water usage mode or the transition mode, then both the pilot and main burner may be turned on as shown in 695 and the system would return to start as shown at 705. If at 690 the usage mode is the low water usage mode, then the pilot would be turned on and the main burner would be turned off, as shown in 700 and the system would return to start as shown at 705.
The disclosure should not be considered limited to the particular examples described above, but rather should be understood to cover all aspects of the disclosure as set out in the attached claims. Various modifications, equivalent processes, as well as numerous structures to which the disclosure can be applicable will be readily apparent to those of skill in the art upon review of the instant specification.
This application is a continuation of U.S. patent application Ser. No. 15/968,626, filed 01 May 2018, the entire contents of which is incorporated herein by reference.
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| Number | Date | Country | |
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| Child | 17649267 | US |
